Mission Enduracool Techknit Cooling Towel 90% Polyester/10% Nylon Proprietary technology cools to 30 degrees below average body temperature when wet Reusable and machine washable; lightweight When wet, stays cool for hours; when dry, soft and absorbent To activate cooling technology soak towel, wring out excess and snap three times; to reactivate, simply re-soak and re-snap Large: 12" x 33"; X-Large: 15" x 36" Proprietary technology cools to 30 degrees below average body temperature when wet UPF 50 protection from the sun When wet, stays cool for hours When dry, soft and absorbent Reusable and machine washable; Chemical-free